Aluminum oxide-sodium sulfate

Several separations on PLOT columns are displayed in Figures 3.37 and 3.38. The selection of adsorbents currently available in a PLOT column format includes aluminum oxide-KCl, aluminum oxide-sodium sulfate, molecular sieves, alumina, graphitized carbon, and porous polymers. These columns are intended to be direct... 

Magnesium oxide, aluminum phosphate, sodium sulfate, calcium sulfide... 

There are several processes available for the manufacture of cryoHte. The choice is mainly dictated by the cost and quaUty of the available sources of soda, alumina, and fluoriae. Starting materials iaclude sodium aluminate from Bayer s alumina process hydrogen fluoride from kiln gases or aqueous hydrofluoric acid sodium fluoride ammonium bifluoride, fluorosiUcic acid, fluoroboric acid, sodium fluosiUcate, and aluminum fluorosiUcate aluminum oxide, aluminum sulfate, aluminum chloride, alumina hydrate and sodium hydroxide, sodium carbonate, sodium chloride, and sodium aluminate. 

Then the solution is dried on sodium sulfate, filtered, and evaporated to dryness. The residue, 1.63 grams is dissolved in hexane, this solution is filtered over 30 grams of neutral aluminum oxide, and evaporated to dryness. On paper chromatographic investigation it turned out that the obtained 19-nortestosterone 17-decanoate which at room temperature is an oil consists of a single compound, according to U.S. Patent 2,998,423. 

The chloroform phase is then removed, the aqueous phase extracted twice more with 200 ml of chloroform and the united extracts shaken out 4 times, each time with 200 ml of 2N sodium hydroxide solution. The alkaline solution is then rendered acid to Congo red reagent, using hydrochloric acid and extracted 3 times with chloroform. After drying over sodium Sulfate and evaporating the solvent, the residue is chromatographed on aluminum oxide (Activity Stage V). The substance eluted with benzene and benzene/chloroform (1 1) is recrystallized from chloroform/hexane (1 1) MP 107° to 109°C. 

C03-0017. Write correct molecular formulas for aluminum oxide, potassium dichromate, lead(II) nitrate, nitrogen dioxide, sodium sulfate, iodine pentafluoride, manganese(II) acetate, and sodium hypochlorite.. 

Acetone, n-hexane, acetonitrile, ethyl acetate, pesticide residue analysis grade Aluminum oxide, Aluminumoxid 90, activity 11-111, 70-230 mesh MSTM (Merck) Anhydrous sodium sulfate, sodium chloride, special grade Distilled water, HPLC grade... 

Anhydrous sodium sulfate, special grade Sodium hydroxide (Na OH), special grade Hydrochloric acid (HCl), special grade Aluminum oxide 90, neutral, activity grade II-III (Merck)... 

Write the formula for each of the following compounds (a) hydrogen iodide, (b) calcium chloride, (c) lithium oxide, (d) silver nitrate, (e) iron(II) sulfide, (/) aluminum chloride, (g) ammonium sulfate, (h) zinc carbonate, (/) iron(lll) oxide, ( ) sodium phosphate, (k) iron(H) acetate, (/) ammonium cyanide, and (m) copper(II) chloride. 

A number of reagents containing oxide components are used in zeolite manufacture [19]. Silica is provided by addihon of sodium or other alkali silicate solutions, precipitated, colloidal, or fumed silica, or tetraalkylorthosihcate (alkyl = methyl, ethyl) and certain mineral silicates such as clays and kaolin. Alumina is provided as sodium aluminate, aluminum sulfate soluhon, hydrous aluminum oxides such as pseudo boehmite, aluminum nitrate, or aluminum alkoxides. Additional alkali is added as hydroxide or as halide salts, while organic amines and/or... 

Numerous methods for the synthesis of salicyl alcohol exist. These involve the reduction of salicylaldehyde or of salicylic acid and its derivatives. The alcohol can be prepared in almost theoretical yield by the reduction of salicylaldehyde with sodium amalgam, sodium borohydride, or lithium aluminum hydride by catalytic hydrogenation over platinum black or Raney nickel or by hydrogenation over platinum and ferrous chloride in alcohol. The electrolytic reduction of salicylaldehyde in sodium bicarbonate solution at a mercury cathode with carbon dioxide passed into the mixture also yields saligenin. It is formed by the electrolytic reduction at lead electrodes of salicylic acids in aqueous alcoholic solution or sodium salicylate in the presence of boric acid and sodium sulfate. Salicylamide in aqueous alcohol solution acidified with acetic acid is reduced to salicyl alcohol by sodium amalgam in 63% yield. Salicyl alcohol forms along with -hydroxybenzyl alcohol by the action of formaldehyde on phenol in the presence of sodium hydroxide or calcium oxide. High yields of salicyl alcohol from phenol and formaldehyde in the presence of a molar equivalent of ether additives have been reported (60). Phenyl metaborate prepared from phenol and boric acid yields salicyl alcohol after treatment with formaldehyde and hydrolysis (61). 

Toon, O. B., J. B. Pollack, and B. N. Khare, 1976. The optical constants of several atmospheric aerosol species ammonium sulfate, aluminum oxide and sodium chloride, J. Geophys. Res.. 81, 5733-5748. 

Drum dryers potatoes, cereals, buttermilk, skim milk, dextrins, yeasts, instant oat meal, polyacylamides, sodium benzoate, propionates, acetates, phosphates, chelates, aluminum oxide, m-disulfuric acid, barium sulfate, calcium acetate-arsenate-carbonate-hydrate-phosphate, caustic, ferrous sulfate, glue, lead arsenate, sodium benzene sulfonate, and sodium chloride... 

Determine the amount (in moles) of electrons needed to produce the indicated substance in an electrolytic cell (a) 5.12 g of copper from a copper(II) sulfate solution (b) 200 g of aluminum from molten aluminum oxide dissolved in cryolite (c) 200 L of oxygen gas at 273 K and 1.00 atm from an aqueous sodium sulfate solution. 

Aluminum occurs widely in nature in silicates such as micas and feldspars, complexed with sodium and fluorine as cryolite, and in bauxite rock, which is composed of hydrous aluminum oxides, aluminum hydroxides, and impurities such as free silica (Cotton and Wilkinson 1988). Because of its reactivity, aluminum is not found as a free metal in nature (Bodek et al. 1988). Aluminum exhibits only one oxidation state (+3) in its compounds and its behavior in the environment is strongly influenced by its coordination chemistry. Aluminum partitions between solid and liquid phases by reacting and complexing with water molecules and anions such as chloride, fluoride, sulfate, nitrate, phosphate, and negatively charged functional groups on humic materials and clay. 

Some of the gas dissolves in the aqueous solution, and the gas pressure developed within the apparatus forces the mixture out through the nozzle, which is directed onto the flame. If some heavy molasses or similar gluelike material is added to the sodium carbonate solution and some aluminum sulfate is added to the sulfuric acid, the solution discharges from the nozzle in the form of a foam in which the carbon dioxide gas is trapped. This heavy blanket of foam containing carbon dioxide settles over and around the burning object. The aluminum sulfate hydrolyzes to form aluminum hydroxide, which, at the temperature of the flame, dehydrates to produce a crust of aluminum oxide over the flame. Both effects serve to extinguish the flame. The common Foamite fire extinguisher is an example of this type. 

A solution of 1.04 g of 6-chloro-9p,10a-pregna-4,6-diene-3,20-dione and 0.95 g of 2,3-dichlorobenzoquinone in 50 ml of dry benzene was heated to reflux for 10 hours. The reaction mixture was diluted with 70 ml of benzene and extracted three times with 50 ml of 2 N sodium hydroxide solution. The benzene layer was washed with water to neutral, dried with sodium sulfate and evaporated to dryness. The residue (0.7 g) was chromatographed on 20 g Of aluminum oxide (activity II). The fraction eluted with benzene-petroleum ether were combined and recrystallized from acetone. The 6-chloro-9p,10a-pregna-l,4,6-triene-3,20-dione melted at 208-209°C(decomposition), Xmax 229 nm. 

Phenyl 4-(Phenyltelluro)phenyl Tellurium2 A 500-ml, three-necked, round-bottom flask is fitted with a cold-finger condenser charged with dry ice/ethanol, a nitrogen inlet, and a magnetic stirrer. 250 ml of liquid ammonia are condensed into the flask, 1.6 g (4 mmol) of diphenyl ditellurium and then pieces of sodium are added until the blue color persists. A very small amount of diphenyl ditellurium is added to discharge the blue color followed by 1.13 g (4 mmol) of 4-bromoiodobenzene, and the mixture is irradiated for 220 min. The reaction is quenched by addition of 10 ml of distilled water, the ammonia is allowed to evaporate, the residue is diluted with 100 ml of water, and the whole is extracted three times with 100 ml of diethyl ether. The extract is dried with anhydrous sodium sulfate, the solvent is distilled off, and the residue is chromatographed on neutral aluminum oxide with petroleum ether as eluent yield 0.58 g (30%) m.p. 88-907... 

---